INTERCOM SYSTEM FOR COLLECTIVE HOUSING

An intercom system for collective housing according to the present invention is provided with room devices (10A, 10B) disposed in each room of collective housing and a control device (20) that is connected via intercom lines (L1) to the room devices (10A, 10B) of each room so as to be capable of com...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	MARUYAMA, Norio
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY TELEPHONIC COMMUNICATION
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